<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>hello world</title>
    <script src="./vue.js"></script>
</head>
<body>
    <div id="app">{{content}}</div>
    <!-- <script>
        var app = document.getElementById('app')
        app.innerHTML = 'hello world'
    </script> -->
    <script>
        var app = new Vue({
            el:'#app',
            data:{
                content:'hello world',
            }
        })
        setTimeout(function(){
            app.$data.content = 'bye world';
        },2000)
    </script>
</body>
</html>